Projector - light blue wallpaper?
I am wondering if the picture quality is still good on a wall with sky blue wall paper ?
HD Panasonic AX200 ?
Assuming no pattern, you can adjust the colour to compensate for the light blue and the wall will work.
However, rather than ordering a screen you can either paint a screen on a wall or build a fixed screen for not much money. The painted screen is your best bet since if you do a whole wall it will not look like a screen but work really well. See the link for some ideas on DIY screens.
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Any light colored wall works pretty well for a projection screen. I have been doing that for years if there is no screen handy. The videophiles will say it effects the color etc but you should just try it, you might be surprised at how good it looks.