I just did an aluminum attache case with a touch screen in it as a sort of jolly green giants ipod it is complete with speakers and touchtone jukebox software, It has over 17,000 songs on it. Kind of a portable party! used an old matx board and powersupply
There has been mention of particulate and fibrous materials clogging micro channels in water blocks with highlighter ink. The Cool-Cases-USA Dyes are made to be mixed with water, completely water based and soluble non-particulate.