If you just want to texture the background for a title screen then you can do something like this:
set display mode 640, 480, 32, 1, 8, 0
sync on : sync rate 60 : sync
autocam off
position camera 0, 0, -300
point camera 0, 0, 0
load image "tiles3x2.png", 1 ` a 2048x2048 image
texture backdrop 1
make object cube 1, 100
repeat
rotate object 1, object angle x(1)+0.2, object angle y(1)+0.3, object angle z(1)+0.5
sync
until spacekey()
end
The image is automatically scaled to fit the screen (sample 2048x2048 image attached).