Here’s a list of some project with great PCB artwork:
Pure art boards
- Full Panel PCB Painting
- Hand-drawn PCB Artwork
- Making Braille Signs out of PCBs
- PCB lapel pin
- Full panel PCB sign by Andrew Sowa
- Lumen Electronic Jewelry
- Creating the Benchoff Nickel
- PCB Art With 4 Layer Boards
- PCB Paintings Facebook group
- PCB Painting Art Nouveau
- Convert Inkscape SVG drawings to KiCad footprints
Functional boards with awesome art/layouts
- OSHWi Octopus Badge by Gustavo Reynaga
- Trammell Hudson PCB art soldering badge
- Minifigure Atmel SAMD21 Board
- Cyborg Ring by zakqwy of neurotinker
- Glowbugs by JasMoH and reverse mount LEDs
- OSH Park PCB Crown
- Brain board for Sarah Petkus’ Noodle robot
- Heart-shaped Flashlight PCB
- Snowbot
- Trixel Interactive LED Kit
- 4CHord MIDI
OSH Park 
More art-yet-function circuits for your viewing pleasure:
http://ghai.xyz/Hacking-Habitat
http://ghai.xyz/Drawing-Circuits
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