Fading spy spray
I got to stop using this spray. I keep stopping to shot at it. I am not sure if this counts as animated since it appears as you get closer, but I am going to try that.
This spray is transparent, and when sprayed the spy has a slightly blue tint, and is made to look like he is uncloaking but not fully uncloaked. I think about making him look completely solid when faded in, but the effect was less like an uncloaking spy.