One day I came online and I found my ALL the textures in my region changed to rainbows, flowers and all kinds of textures...all kinds except those I had intended to use. I panicked and called a friend, but he saw everything normal...so the next panic stage came with the question in my head of whether I had fried my graphic card?!
Ahhh panic not! - said another friend. Just clear your cache and relog. And so I did...and that gigantic flower building (first photo became normal again with ocre stucco and plaster borders!!
What a relief to see everything come back to its normal (yet unfinished) self!! Wheww!!!