LED strips are controlled by a Raspberry Pi, connected via a custom level shifter that first has been developed for FlaschenTaschen but is now broken out as separate Spixels PCB and library.
This adapter to the Raspberry Pi can support up to 16 SPI LED strips (e.g. WS2801 or APA102) at once.
We have the Pi in a separate crate together with one of the power supplies. It is held in place with zip-ties through the holes of the crate using this laser-cut mounting plate. To be easily modifyable, it is written in PostScript and can be converted to a DXF file (a typical input to laser cutters) with the Makefile.