I would like to preface this description by outlining that I believe this is very important. I recently looked up a study that said half of all people polled said they had a particular interest in the subject.
Here is my proposal at two different tiers. This should be achievable.
LOWEST COST
Create four different foot archetypes based on the four different skin colors. This really only requires one drawing with multiple recolors. You may also be able to add toenails with different paint styles on it.
For example: 50% of all toenails can be uncolored while the remaining 50% can have simple shades and rares such as Golden Toenails, Rainbow Toenails, Shimapan Toenails, etc etc.
I think this is a low risk high reward endeavor that satisfies people with a low cost airdrop that requires a limited amount of time investment for the production of the art.
HIGH COST
You can have everything with the above tier but also perhaps a 25% chance (or less) of getting different styles of shoes. Perhaps 10-20 different styles of shoes or socks being added to the Feettdrop. You could do 10-20 styles of socks as they can easily be recolored and then do 10 limited edition super rare sneakers, boots, etc.
This would cost a lot more in terms of time investment. I am going to assume that the uwucrew artist could draw this but this could be anyone. I highly recommend reaching out to the FNDcommunity to inquire about rates for such a project. In fact, I am personally willing to take on such a project if given 1 ETHER for the troubles (2 ETHER for the sneakers). I WILL MAKE IT HAPPEN.
I highly recommend the release period being pushed to within a month or so after the proof of stake merge. This would reduce the carbon FOOTprint of the feetdrop.
Thank you for reading -Starlin