I checked out a bunch of books from the library and lined up a number of projects. The first one I completed was from Exquisite Miniatures in Cross Stitch and Other Counted Thread Techniques by Brenda Keyes. This book is not specifically for dollhouses but has smaller real life size projects that can be used in miniature settings both with and without minor modifications.
The art is called Orange Tree, so I thought it would look nice in a conservatory.
I stitched it on 28 count evenweave fabric in mushroom color. The book had called for it to be stitched on 22 count needlepoint canvas. The color of the fabric saved my having to stitch the background, and the higher count made the project smaller in size. The needlework is mounted on stiff felt on the back.