Here are links to pictures of some interesting projects.  For those just interested in tools, these are ideas and designs applied to a particular problem or application.

Mini Tinker Tool and Cutter Grinder

Shop built grinding fixture from standard steel stock, partly scrap.

Straight Knurling

Applying a straight knurl using one wheel from a conventional diamond knurl holder.

T-Slot Crosslide

Atlas (Craftsman) 12" lathe with T-slotted crosslide.