I found that a simple mani-pedi can make all the difference. But, as a teacher, I don't exactly make enough to justify going to the salon every single evening after work. So I brought the spa home to me.
The Spa in a Box experience would go as so: I put on a facial mask, fill up the containers with hot water and bath salts, and soak my feet while getting a mechanic back massage and watching whatever trash TV I felt like watching. I'd then lotion up my feet, prep and paint my toe nails, and relax some more as everything dried. If the day was really bad, I'd also do my fingernails (although I rarely do my fingernails, save for a few projects, as I'm a recovering nail biter).
The best part is that this is always out and ready. I don't have to go digging through our bathroom closet to find what I need. I just pull out the chair, plug it in to the nearest electrical outlet, and relax -- which is needed, when your students make you want to pull out a chair, throw it through a window, and dive out to freedom.