Look "delta" models of all kinds, or the Shimano versions that use the same cleat.
Cheap to buy used or new, cheap cleats, large footprint on the pedal, and in colors to match a bike.
Cleats are compatible with many other brands of pedal, too.

I've got red, yellow, purple, silver, grey, black, white, have had blue.
I saw some Ti ones but he wouldn't sell 'em.

Horrible to walk in, but if you have a lot of bikes, not a big deal to outfit 4-5 for $100 total.