is there a simple application which can sit on top of a fullscreen game to give me an indicator of when there is a lot of network activity? I can only seem to find system tray apps or programs which work outside of fullscreen games. Preferably something transparent so i can see through it.

A little background info: I used to have my PC sitting sideways on my desk so I can see lights from the network card. The lights stopped working a while ago and all I need is a little blinking application to tell me when there is activity. I do not need a detailed graph or bandwidth usage, just activity notification. I've looked everywhere for something, maybe you guys are better at searching than me.