Bidoofcrossing is the only one I can think of off the top of my head. I don't have my own ACNL blog but tumblr constantly keeps recommending some to me. It's not doing it now though unfortunately.
Three of my favs are pasteliapeaches (who is such a sweetheart cheesus + her town is super cute), renviera (delicious art hot mayor I mean what), and mablerok (really fun to follow, nice art, perfect characterization, etc).
I don't have a tumblr so I just bookmark these but they're really seriously wonderful.
I have a tumblr but I only post ac on and off - but I like ricepuddingcrossing and comfortcrossing! They usually post cute AC related things & when I do reblog it tends to be from them.