I have written a blogpost about how our artists reuse 2D assets that have been drawn for daylight in a nighttime level, in our new game Swords & Soldiers II. These assets have their lighting drawn in, but it turns out that with some simple tricks they can be used for a night setting and still look good, without redrawing the lighting in Photoshop and without taking up additional texture space. I have put the most interesting images below, there is more and some additional explanation and videos at the complete blogpost here:

Using 2D daylight assets to create a night level

I hope you find this interesting!

More images, videos and info at the complete blogpost.

Very nice. The artwork is beautiful. DId you use Photoshop?

Yes, our artists use Photoshop for drawing things. They then put them in levels in our own in-game level editor. Animations are done in After Effects for frame-to-frame stuff and our in-game animation tool for simpler things. (I am myself a programmer at Ronimo, by the way.)