Miscellaneous Alice > Flag of Wonderland

[Mad Hatter II]

Has anyone ever tried to make a flag of Wonderland? A good flag I mean, one that looks the goods and all

[Cheshire Dodo]

These are a few thoughts I have had about a 'proper' Wonderland flag, since reading your post:

The encounters Alice has in Wonderland were all derived from places, people, and objects which were around Christ Church in Oxford. So, the Christ Church flag could be used as a basis for the flag.

This is a poor image of the Christ Church flag (on the Flags of the World website)
https://www.crwflags.com/fotw/flags/gb_ouccc.html

It does show that it is directly taken from the college’s coat of arms though:
https://en.wikipedia.org/wiki/Christ_Church,_Oxford

The Christ Church flag's layout and colour scheme are used with the following alterations to the heraldry:
The Leopard Heads: Replaced The Cheshire Cat face
The Red Rose: Remains
The Blackbirds: Replaced with Dodos
The lion: The Sleeping Griffin
The black colour on the background is altered to blue.

The Cheshire Cat and Dodos would symbolise Charles Dodgson / Lewis Carroll
The Red Rose is the Royal flower of Wonderland
The Sleeping Griffin would symbolise that Wonderland is a Dream Creation
The flags background are now the two traditional colours used for Alice's dress (blue and yellow).

I should point out that this is just a very basic idea, thought up in a short time.

[QueenJabberwocky]

I haven't tried yet but it's such a fun idea!
I thought about incorporating a coat of arms visible in one of Tenniel's illustrations:

[Mad Hatter II]

that's actually a good idea