Hi Oishi,
While most of Messerschmitt's Schwalbe are depicted in late-war RLM 81/83/76, some with early werk numbers were painted mid-war dayfighter 74/75/76. Monogram’s Official Luftwaffe Colors & Markings Guide verifies this. My references state that some Schwalbe wore an undercoat of a light gray upon which the factory stenciling was painted. These areas were then masked to avoid the factory-applied standard camouflage over coating. Additionally, much of the stenciling was overpainted by field camouflaging.
Some 1,200 ME-262s were built, and it seems you can find 1,000 different camouflage patterns. You can see two color WW2 pix here (see photo 70 and 87)
http://www.ww2incolor.com/gallery/german-luftwaffe Here's my rendition of Trumpeter's -262:
Song of the Swallow