SkinIt.com specializes in making custom, glossy-vinyl, adhesive gadget skins for your electronic devices. Just select your device, choose your specific model, and browse through the selection of patterns.
Devices aren't just limited to phones and laptops--SkinIt also has patterns for MP3 players, e-readers, and gaming consoles.
SkinIt has a section specifically for Valentine's Day designs (pictured here)--but if that isn't your beloved's style, try something else, like a favorite cartoon character or sports team.
Don't see anything appropriate? You can create a design by uploading an image (a photo of you?) from your online photo account or home network.
Vendor's site | $15 to $40