Vote type: add the option to supply a custom icon

In the voting type of a photo contest there is the option to choose likes or hearts, it would be nice to have the option to select from a set of icons the one that best fits the type of contest.
For example now that we are in Halloween we would be interested in having some icon like a spider or a pumpkin so it is more fun to vote.

Hi,
this request is quite special, but we are going to discuss it.
Kind regards
Philipp