Pets with old school tv or radio antennas would be cool. Like deer with those aluminum roof arrows as antlers. One could even have a satelite dish! They would be metallic and beige plastic with designs of wires, screens, speakers, knobs, and lights on the antennae and control board. They arent specifically centered around television. Just transmission and receiver equipment in general. They could even have visible waves from the transmitting ones. Design is technology but can be any era of time.
Also a pet based on types of files or notepads. With ring clips along their back to hold their papers inside. Since its paper, its alot of freedom to color and layer paper types.
Oh and we need a crystal dog. But the crystal is see through with colored flat polygon like designs. Think Starovski Crystals.
Lost colors litter. Based on running inks. Litter has wet inks that run and drip off of the pet as they grow. Can be black & white, greyscale, or rainbow inks. But the twist is they are dripping wet at full grown stage.
Tunnel lights litter. A series of pets with a tunnel design at night. Tunnel can be straight or side view. Tunnel can be for cars, people, or just natural phenomenon. Like orange sodium lights on a desolate road, lit blue trees on an empty park walkway, or glowy green fireflies froming a path into a dark and scary forest, its alot of potential for some very cool visuals. This one might be hard due to the potential for alot of detail needed. The idea I had is a mysterious eerie feel of uncertainty. But can be whimsical like for a wedding or Christmas. Tunnels are pretty versatile for conveying emotion. Just depends on composition, scenery and lighting.