I've made pans from my tube paints. This means I've filled each well with an entire tube and smoothed the top flat. Not only does this eliminate the problem of searching for tubes if I should run out of a color midway through painting but it's much easier to keep the paints moist. I don't paint everyday so this has been a real boon for me. I did leave one well empty just in case I need to add a color down the road.
Also something I'd never done before was to create a painted palette so I can see at a glance what each color will look like on the paper.