I remembered that I had read a tutorial about how to make a water card with a small plastic bag and some clear hair gel, so decided to give it a go. Here is the result:
I used the retired cardstock Baja Breeze but also current cardstocks and inks - Bermuda Bay and Midnight Muse and Whisper White. I heat embossed my fish in Midnight Muse then sponged him in Bermuda Bay and So Saffron, and added some silver gel pen highlights.
The background is from one of our designer series paper stacks in Island Indigo, stamped over with Bermuda Bay ink to show the coral.
I added some stamped images in Bermuda Bay and Midnight Muse for the card front too. The porthole is made with two of Stampin' Up's! circle dies, and the studs are more silver gel pen dots.
I mounted my fish on top of another stamped image of the same fish.
The plastic bag has hair gel in it but also some blue and green chunky glitter.
I sure hope he adds pleasure to your birthday, Luke!