Trenton Carami

Hi all, I have a question - I know it is bad to use fullbright for walls because of the midnight setting, but how do I get my walls to NOT look greyish if I don't use it? Newbie builder here and want to do it right and eventually want to sell them, but can't figure out how to get my textures to still look white without fullbright. I understand someway the lighting aspect of when you are doing this for yourself, but I need to have it look good (with whiter/lighter textures) when I sell it. I use a graphics program (paint shop) to create light shadows for the textures that I put on the walls and it looks great. And then I put it on the building and it looks grey in Midday setting. aaaarrrrgggggg!!! If I click fullbright it looks perfect - but on Midnight setting it looks baddddddddddd........ If someone has any tutorials or ideas on an easy way to this to make the white/lighter textures show up properly on Midday/Midnight settings WITHOUT using fullbright I would greatly appreciate the help. Thanks! Trenton