Recumbent Accessories My cousin recently bought a recumbent bike (well, I suppose it's technically a trike) and has been having a blast with it. I'd love to encourage her new hobby and get her an accessory for it as a Christmas present. Unfortunately, I know next to nothing about recumbents and what might be useful to have.

So, recumbent riders: what would you love to have or what do you find useful when you go out for a ride?

Update: My problem, specifically, is that I don't know what make/model of recumbent they have. So I'm looking for accessories that will work with all (or almost all) models. Not necessarily accessories that are exclusive to recumbents in particular.
There's very little you need on a 'bent trike that you wouldn't also need on a conventional bike. Rear jersey pockets are useless on a 'bent, of course, so it's nice to have an accessible place to store energy bars and stuff like that (I've used a bag that's intended to fit above the top tube, behind the stem of a conventional bike, and a small fanny pack turned sideways). Rearview mirrors are a necessity, but I think all new trikes come with them. Many trikes lack good bottle-cage mounting points, requiring you to improvise with clamp-on cage mounts; I use a Camelbak Unbottle and some webbing straps.

Trikes often have oddball tire sizes, which you would need to know if you were going to get her spare tubes. Normal seat-bags won't fit, and some trikes don't really need them. There are recumbent-specific bike shops on the Internet. It wouldn't hurt to ask her what she got.

So, regular stuff: a cycling multi-tool is always handy to have (assuming you know how to use it). Likewise the typical frame pump, patch kit, lights (may need special mounting adapters), etc.