This sounds pretty similar to the ghost effect. You can use it by using this block:
change [ghost v] effect by ()Hope that helps!
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However, we don't have pen color transparency yet. That would actually be interesting; you can see how many times a sprite crossed over its own path, for example.
180 second rule! This is probably my 25th time to send this!
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In sprites, the proper term is Semi-Transparency, and if a picture supports this, it's called 32bbp. Scratch is only 24-bit. The proper term for the pen transparency is Opacity. I want it.
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