I need something for my current HA to stand on so it doesn't look like she's just hanging in mid-air.

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Please nothing snowy or wintery.

Kinda depends on what you want her to be standing on

Do you want a ground item or like a sort of magic carpet kind of thing? XD You can always go into the wardrobe and go through the ground items

There are grass items but they don't go all the way to the edges. So it looks like she's standing on a levitating chunk of sod.

Mmmm

There's seashore items I know of and some others

Like

I've found Cloud Nine and Cloud of Eros. I like Cloud Nine better but it's over 4mil so I guess I'm stuck with the other one which looks too blue and kind of clashes.

Well good luck getting the one you want :)