Freezer tray ideas for home-made food ?

[gregzz4]

I'm looking to freeze my home-made food in cubes - small like the tinfoil-pushout cubes of frozen food we buy
I don't have enough fish right now to use larger units

I can't find an icecube tray with small enough units

I've heard of some peeps using eggcrate and I'll try that if need be

What other ideas are out there ?

Thanks for any input