There are 2 jalapeño seeds in each of those 4 'empty' pots. I'll let them all grow a bit, then kill off the weaker ones. I read that that's a good way to make sure you only end up with strong, healthy plants, so I thought I'd see how well it works.
That tall, thin plant is a radish that I put in there as a sort of test subject. I have radishes in other places too (the garden, the kitchen windowsill, an artificially lit propagator etc.), and I compare them all so I can keep a check on which growing environments are working well. They're all a bit stretched though, as you can see in the picture, because they didn't get enough light when they first popped up.
I also have a heat mat underneath them to keep them nice and warm, even when the light's off.
This is just a temporary box, I'll be upgrading to a more solid structure with proper insulation and lighting when I get some more money. I'll also be making little modifications to this box while I save up for the new one, like putting foil on the other sides to help keep the heat in.