The phrase "a sheet of yellow" is correct and usable in written English.
It can be used to describe a physical sheet that is colored yellow, often in contexts related to art, stationery, or design.
Example: "I need to grab a sheet of yellow for my project to make the poster stand out."
Alternatives: "a piece of yellow paper" or "a yellow sheet."
In front of him, on the table, was a sheet of yellow legal paper with his handwritten notes.
Two weeks ago last Friday, on Feb. 20 to be exact, Alistair Cooke slipped a sheet of yellow paper into his ancient Royal manual and typed, "Letter From America No. 2869".
Caciotta-filled ravioli, the mild cheese accented by a simple tomato sauce, were absolutely delicious; the trucioli (a curly short pasta) with bottarga and a sheet of yellow squash got mixed reviews.
"Then I kind of smash them, so that the lines I get are inconsistent". She stroked a sheet of yellow paper with the brush, creating delicate striations of burgundy.
Taped to the inside of a sliding glass door was a sheet of yellow construction paper that Griffith had folded, in an origami-like fashion, into a crude prototype of a recent insulation idea.
He greeted an overflow crowd of more than 3,000, reading from a sheet of yellow legal paper as he recognized some of the prominent people in attendance, and giving a special mention to a contingent of New York City firefighters and their commissioner, Nicholas Scoppetta.
It took fire instantly, and sped around and around on the surface like a demented meteor, with a huge sheet of yellow flame above it.
Several hours later, they emerged with an outline of the settlement on a single sheet of yellow legal paper, which Judge Pollack then framed and put on his office wall.
All he found in the desk was a single sheet of yellow scratch paper, on which Faulkner wrote in pencil "A and B are two aviators.
