I remember in school doing the old "net send /domain blahahahhahaaa" and eventually making a crude BAT script that autoran when you inserted a CD to spew line after line of corny middleschooler copypasta.
I agree with ewweezdsd. I've been doing the same with slimline HP/ Dell towers, off-lease C-tier corporate equipment. 7th Gen i7 32gb ddr3 boxes for under 200$ usually. Low noise, heat, and power consumption. I never could justify having an actual server room in a house with the loud fans whizzing and the heat.