Need some ideas on targets to use for a little archery game im adding to my mod.

Gist is Player stands on pressure plate and a random set of targets appear for a varied time. The (ex) more red targets hit the more points awarded, and the more points the higher the reward. The trick is the different target options.

I thought about using a collision sphere and playing/placing an effect on/at it(?) or something similar to that. I've looked around but couldn't think of a location where something similar is done.

Thoughts on the best route?