These are all done on 4x4 inch post-it notes. I've been looking through lots of decor magazines lately, hence this little obsession with interiors.
The urge to add more colour with paint on these was certainly diminished by the colours of the paper, but using coloured pens was a fun way to add some accents, and a white gel pen was a handy way to add low contrast background elements. I did all of these without any pre-sketching in pencil, which was actually liberating, hence the wobbly lines and imperfect grids.
Many of these are sold already but check here to see what might still be available.
(I ship them attached to a 5x7 card like this, so that they can be popped into a frame easily for lazy people like me.)
(Maybe I should make prints of some of these?)