There are at least two times that tiny bits of Star Wars have ended up in Star Trek. The Ferengi Marauder, And the breen helmet. When you look at the Ferengi Marauder from the top, it looks very close to the symbol of the Rebellion. And when you look at the Breen's helmet, it's very close to the helmet Princess Leia wore in Jabba's palace. There may have been more but I probably missed them.