Here are audio devices from my home lab. Some are strictly unique and some can be build in quantities.
Here they are in few basic categories:
Touch Delay - momentary controlled delay with feedback loop insert in a box
Korg Volcas (modded) - modifications of Korg Volca Beats and Volca Bass
Analog Rythm Synthesizer for House
Kappa2 (modded) - modifications of an 8 step mini sequencer from Dreadbox
Optoparalakser - 8 step midi sequencer designed for live video camera switching by controlling a video performance mixer
Spliter Pre-Amp - STEREO to 7.1 spliter and pre-amplifier
ACTG - analog synth controller with CV and GATE outputs
K'mono prototype - Korg monotron dock station and hack
Utility-1 - utility unit with PSU, envelope generator, VCF and mini mixer
10 Step Sequencer - heavy duty sequencer
Nano 8 prototype - compact 8 step sequencer
Silver Tube - light sensitive drone lab in sturdy aluminium casing
0.1 - simple, single-voice, passive (GATE powered) drum with CV tone control
K'nanopad++ - analog input to your DAW
Matrix - 4-in 4-out passive mixing matrix
Led Flood - regulated warm/cold white LED food lamp for photo shooting.
The Pink Thing 2 - an error based mini synth, mark II
Yellow - simple 3 oscilators drone synth with XOR modulation
The Red - simple 3 oscilators base synth
The Black (Photosynthesys) - light sensitive synthesizer with aux input for external audio destruction
The Pink Thing - an error based mini synth
U1 WaveGiver - stereo audio send unit with phono and line inputs, 4 outputs per left and right channel and additional mono sumed output
If you are looking for the modules - check out the Modular page.