Shape on the curve surface

Gaieus

Ah, St Nicholas church! (Interestingly, the Hungarian name of the village is also St Nicholas). Anyway...

You can draw simply rectangles to represent the sides (and other faces) of the church and use TIG's super drape plugin to then drape the linework of the different architectural elements onto these rectangles. This plugin will also "drape" the materials (in your case simple colours of course).

Note that according to TIG's description (and also as the native drape tool works), "The draped group must be above the 2nd group..." so you will need to rotate the whole thing (church and face together) to do this - and as many times as needed.

Next step is to use TT's CleanUp plugin to get rid of any unneeded edges on these faces. (Examine the installation instruction carefully as this plugin needs an additional plugin library to install). Use it only on a selection (the newly draped face) and make sure NOT to ignore materials (otherwise it will erase all edges.

Now select one of the faces on the face, right click on it and > Make unique texture. It will pop up a dialog asking what the desired size should be - just okay it as you can edit this texture image later.
Now select all the facets again > right click > combine textures. It will ask if you want to remove dividing edges - yes. Now you ended up with a single face - a side of the church with an image material on it. If you right click again, you can even edit it in an external image editor of your choice, adjust colours, add dirt here and there, resize the image (about 1 cm on the church should be some 1-2 pixels in the image so that Google likes it) and when you save, it will automatically reload in your model.
Set your favourite image editor under Window > Preferences > Applications.
But first of all, select all the current church and group it otherwise you will end up with a mess (I really wonder why you did not use components here - I see you are an extremely enthusiastic modeller and made a beautiful job with this church but components would have made your job much easier - okay,later on with components).

cleaner

Uh, this is all, for now, it seems complicated. I'll have to study your advice slowly, then I might try. If I understand correctly TIG's plugin project - shapes from 3D model to the surface, is it? Or to capture some better pictures when I went to the village for several months.
For components and groups, I learned later when I had already made half the work. If I re-worked model it would be a better of course.

Gaieus

Well, taking photos is definitely the best way to satisfy Google. (And yes, my first "real" project was a Turkish mosque in town and I only learned of components later - how much easier it would have been!)