If by mini advents you mean Baby Advents, then sure, for the cost of a foam kit, about $13 they'll work pretty well.
I refoamed and recapped one set, I'm just starting to refoam another, and the caps just came in from Parts Express. I bought both foam kits from Rick Cobb.
Now, they may not be the finest spks but depending on where you use them, they do a pretty good job!