nia Oh many, macppc mac mini, I need to get my hands on one of those. I have an iBook G4 I intended to play with powerpc, BSD, and maybe mess around and make a crummy OS for fun and that thing is a pain to lug out and play on for that sometimes.
Machines running BSD right now (may get some pictures later when Im off work).
Macbook pro 2015 (12,1?) - NetBSD dualbooted with MacOS
Apple iBook G4 - OpenBSD (collecting dust currently)
Macbook 2006/2007 (2,1) - NetBSD (play around with some C)
Mac mini 2009 - NetBSD (serves as a little server)
Lenovo Ideapad (cheap walmart one) - NetBSD dualbooted with Void Linux
Dell inspiron netbook - FreeBSD