Messiest thing Arthur has ever done. and he loved it! I just used paper; will do someday with canvas---Snowflake canvas art. Do a whole series of kid Christmas canvas art projects! Blue = snowflakes. Green = tree shape. Yellow = star. Red = wrapped present shape or ornament or holly. Kid art - just remove the masking tape when the paint dries (or before, works both ways).
Snowflake art - just remove the tape when the paint dries!