Color Stick
The color stick is an 8-pixel (24 DMX channels) LED display. Each pixel is made of two RGB 5050-sized LEDs; the LEDs can either be loaded on both sides or all on one side.
BOM
From Mouser: 581-06035A220J|2 81-GCM188R71H104KA7J|9 810-C1608X7R1A334K|2 810-C3225X7R1E106M|1 720-LYQ971H1K136|1 649-67996-402HLF|1 538-70287-1001|1 22-28-1040|1 22-15-2046|1 301-1.0K-RC|4 302-4.75K-RC|1 595-TLC5916IDG4|3 701-SP485RCN-L|1 556-ATMEGA48P-20AU|1 815-ABMM-20B2-T|2 821-TS78L05CT|1
In addition, you need 16 5050-sized RGB LEDs; the ones from the group buy are ideal. Mouser 593-VAOS-5050RGBW1 would also work, but the channel mapping of red and blue would be reversed.
Schematic
PCB
Front-side copper
Back-side copper
Front-side silkscreen
Back-side silkscreen