Searching for daily folds, O came across an interesting 6 part modular cube that has much development potential:

each face features a colour changed heart but I imagine that with a little inventiveness you could fashion diamonds, spades etc, or other things as the basic module solves the problem of liberating colour-changed flaps rather nicely.

Not sure the locking mechanism for each module is very sturdy, but paper tension also seems to be at play here.