Blinking Button Border
This effect looks cool on buttons, but you can use it for whatever you want. Try it out and see what you think.
Step 1: Start by finding/making a button base you like, then add your sitename to it. Here's the Button I choose to use:
Step 2: Dublicate your button once, by clicking on this button:

. Then zoom in on the frames.
Step 3: Select the brush tool, which looks like this

, and then choose the color you want to have on the second button border. Then use the brush to colorize it.
Step 4: Save your button and you're done, here's my result: