DIY Yarn Wrapped Jam Jars - it's a good idea for the tunnel just to light the way. A solid row of these along the sides of the tunnel would be a good alternative to using whatever lights are built into it.
DIY-candle-holders-with-doilie I am pretty sure that I could use paper doilies and paint them my colors and modge podge them. Yep, I sure could! I would definitely use tealight lights instead of candles.