Do you need any jigs for particular projects? 3/4 is stiff enough, and
those pieces are a size that often goes into such things. Band saws and
table saws can use a lot of those for tenoning and other special cuts, and
routers need a ton of jigs.
Even hand tool workers have uses for them. Pieces that size would make
bench hooks (Screw/glue a block to the top side of one end and the bottom
side of the other end. Hook a block over your bench and one or two bench
hooks can support a board for handsawing, chiseling, etc. and keep your
tools from cutting into the bench.)
Glue up two or three into a stack and bore holes to organize drill bits,
chisels, carving tools, etc. Cut them in half the long way and mount on
wall brackets for tool racks.
I just used a piece of 3/4 as a base for laminating some bulletwood
scraps; now I'm carving a hollow in the bulletwood for dishing out blades
for fireplace shovels.