A ring to murder for

So I got myself yet another goldsmithing book, Jewelled Rings for All Occassions, by Bashful 'Bonecrusher' Bledrickson, and I've given a shot to each of its 10 rings (no jewel-setting yet, though). Although the author is evidently a dwarf, it seems to have been made mostly with assassins in mind, as besides 3 or 4 options, most look like 'house' rings.

look book

A linen-bound book displaying a single jewelled engagement ring, embossed in gold on the front cover.

Engagement ring

Deftly crafted from gold this solid band serves as the backdrop to a setting for a large gem; a symbol of love.

Hearts engagement ring

A slender band of gold has been sculpted with a delicate design of interlaced hearts and adorned with a setting for a medium gem to symbolise a promise of marriage.

Gaudy ring

A setting for a huge gem takes centre stage on this elaborately designed ring that features swirls of gold.

Cobra ring

A cobra crafted from gold coils around to form this ring.  The snake's hooded head is raised as if poised to strike.  Eyes take the form of two empty tiny gem settings

Viper ring

A gold representation of a deadly viper, this ring has been skilfully shaped to coil around a finger.  It has a distinctive zigzag pattern etched into its back and even the scales are painstakingly represented.  The head, with two empty tiny gem settings for eyes, is reared to strike.

Black Widow ring

A band of gold spiderweb stretches to encircle the finger, with a large gold spider sitting patiently on the front of the ring.  The spider's back holds an hourglass marking, accentuated by two empty tiny gem settings.

Raven ring

A row of sculpted gold eyeballs forms the band of this ring.  A large depiction of a sleek raven in profile decorates the front of the ring with a setting for a tiny gem for its eye and a setting for a medium gem clutched in its beak.

Bands ring

This ring has been carefully sculpted from gold to give the appearance of three distinct bands merging.  A setting for a large gem completes this study in simple elegance.

Scorpion ring

Obviously crafted by a craftsperson of some skill, this gold ring features a delicately sculpted scorpion.  Its fearsome tail is arched and poised for a lethal strike, the sting tipped with a drop of venom, represented by a setting for a tiny gem.

Tree Frog ring

Gold has been forged and sculpted into a tree branch form and coiled to create this ring.  Sitting on the front is a tree frog with two empty tiny gem settings for eyes

Not that I would ever be caught wearing one of these, nice as they are, but I guess I could be employed by some wearer of black to make them for him or her...

In the Assassin's Guild

It is a pity the ninjas don't allow us to use their facilities, as I would relish the possibility of trying their pottery room, learning their tea ceremony and doing some flower arranging and marbling (the last option isn't impossible, but the equipment for doing it counts as furniture, and I have no place to put it). The morporkian Assassin's Guild is open to all, though -at least, most parts of it. The poison labs remain 'off limits-, and taking a look at its classrooms, one find curious learning oportunities...
One I wasn't able to activate was the Komt of Yoyo's telling me assassin stories in the varied living languages of the Disc (he'll only do it if you're an assassin yourself), but nevertheless, you can try plaque-reading and (on a totally different scale) piano playing at the Modern Language and Music classroom. What I did discover to my delight in the next classroom (Monsieur le Balourd's Dance and Deportment) was this:

A large, airy room with strong wooden floors and a high, arching ceiling. A small piano sits carefully in one corner of the room, while an elaborately set up table is in another area. Posters outlining the basic steps of various popular dances line the walls, while instruction manuals and copies of Twurp's Peerage are scattered over a low table under the window. A room full of everything a student needs to turn themselves from bumbling buffoon, to social butterfly.
There is one obvious exit: west.
Monsieur le Balourd is standing here.
>
look ceiling
The ceiling arches high above your head, inlaid with rare woods. A crystal chandelier hangs from the centre.
>
look chandelier
A delicate crystal chandelier hangs from the centre of the ceiling, casting light over the room.
>
look piano
A recent invention, this piano is actually a pianola, a clockwork piano that plays music without the need to have a pesky musician sitting at it. It is a very expensive instrument, much more so than its non-clockwork counterpart, but is still within the Assassins' Guild's budget and is used to train students to deceive the eye.
play piano
You covertly wind up the piano and pretend to play a delicate Llamedos hymn.
>
play piano
You covertly wind up the piano and pretend to play a delicate sonata.
>
play piano
Saving...
You feel more able to deceive the eye.
You covertly wind up the piano and pretend to play a delicate sonata.

There's lots more to play with, in the class and in the guild. I'll keep looking...