mommer needs help!

you sees the pretty stars an' snowflakes inna background? well, she maked that follerin' some destructions onna web about making backgrounds specifically fur blogger, but now it don't fit our bloggie an' she wants to make the green background blue anna type white (maybe). kin ennycat or bean bail her extensive @$$ out? we would like to haff our bloggie all holiday-ish!! (an' sometime befur the holidays;-) fanks in advance!!