Rainbow regular balloons was a tempting idea, but I decided I'd rather keep my old ones than date-trade them, and I don't want to buy second copies of the classic ones, so I think I'll just take whatever order I get where they're concerned and figure out what to do with them from there.
...Instead I decided to be a super-masochist and aim to get
all the Heart Balloons in rainbow order.
That way I could have a huge double row rainbow with a free space at the end
(or two if I leave off the Sweet Heart Balloon; three if I leave off pink too), or just have a wide variety of other Heart Balloon combinations at my disposal!! I don't normally pursue rainbow order in my collectibles, but this feels like a good time for it.
(or swap yellow for orange!)
<inverse bi pride flag balloons!!