Design 1: Out of the three designs, this is the one I would pick to be used. I used primary colors to keep it simple, while using the geometric squares to add some modern flair.
Design 2: Again, I tried to keep it clean and relatively simple.
Design 3: I wanted to capture an old fashioned design. The initial design changed drastically, obviously. This one I didn't have as clear of a goal in mind, I just went experimented to see what would happen.