First I used the faux batik technique to create the balloon and blue base layer (see the link for a Tim tutorial on how to do it). After stamping and embossing the balloons, I blended different shades of blue Distress ink onto the background and also stamped some mechanical diagrams over the embossed images. I flicked some water droplets onto the background which reacts with the Distress ink and makes a cool spotty pattern.
Next I made my custom mask to create the ray bursts. Tim Holtz has these really handy sheets of masking material that you can use to make custom masks. First I sketched the lines I wanted on a piece of scratch paper, then just laid the mask sheet over the sketch and drew in my "cut lines" with a Sharpie and ruler. Then, taking a nice sharp Xacto knife, I cut out my mask. You can use these sheets in a die cutting machine to make masks too. Anyway, here is what it looked like:
Most of the supplies I used can be found at Inspiration Emporium. Use my code JUICE at checkout and save 10% off your order. Have fun creating!