Some are simple add-ons and a couple are more involved.
Entry 'blank' wall - Didn't want to screw into this wall after reading that the vent stack is somewhere inside - so 3M command hooks it is! Hook for coats/swatshirts with one of those hangers that lets you hang 5 hangers in the space of 1, IKEA pocketed hanger with flashlights/etc, and hanging shoe pockets, which didn't work out and has since been removed.
Wire shelving between upper dinette cabinets and upper kitchen cabinets (3M hooks on cabinet sides, resting in cargo area without being held on. Longer shelf has 3M hook above window also)
DH built a fencepost 'stinky slinky locker' with the gutter slide out tray
Towels in a hanging 'shoe organizer' (I use this at home in DD's bathroom too)
Suction baskets on the dinette window for pens/pencils, odds n ends. We actually used the white one (more sturdy) for our beverage cans
while we were playing cards. That way the drinks didn't tip over when the table got bumped/wobbled, etc...
I posted in another thread about the cubby we made above the fridge, and DH also made one above the corner cabinet by the door but I didn't take pics.
More to come I'm sure!