What's powering your Creep, 120vac? You just need an AC to DC power supply. Anything from 3V to 12V will work, such as an extra phone charger. Those "battery" LED's you've shown are nothing special, they're just standard LED's with resistors to accommodate the 9 volts, so don't waste you're money. Look for 12v led's on ebay if you don't wanna mess with adding resistors. They have resistors already added to handle 12V. They will also work with 9V -5V though they might be a tiny bit dimmer, probably not enough to notice. Also in case you didn't know, LED's are a diode so current will only flow in one direction. The positive and negative wires must be correct for them to light. If you connect them wrong, it won't hurt a thing, they just won't light.