I thought the door plaques we’ve got for teens deserved a write-up of their own. They’re one of the most popular items at fairs, but have only just recently made it onto the website.
There is a bit of a theme going on with them, you may notice:

if he is a bit untidy but very eco friendly
there’s the one above saying there’s enough wasted energy in this house without me tidying my room. Then there’s this one below: when the floor’s full please use the wardrobe

when the floor is full please use the wardrobe
and this one: on a really good day you can even see the carpet

you can even see the carpet
and this one: GHAOS, PANIC & DISORDER - my work here is done

chaos panic and disorder
As well as the untidy, chaotic theme, the shoe and bag plaques are popular with teens as well (as adults of all ages):

if in doubt buy more shoes
and

give a girl the right shoes
or you could have it as a door plaque

door plaque
They’re all available in any colours of your choosing, so you can keep it neutral or match it to the decor (or just choose your favourite colours). I can also change the teen in the first ones so the hair, clothes and skin colour matches your teen.
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And if you have a favourite saying you’d like me to put on a similar plaque for you, do let me know. One mother threatened her son for a long while that she would buy a SWAMP door hanger for his room. She did just that when she found out what I could do: