Step 1: Coat exterior of can with spray primer.
Step 2: Cut handles off spoons; discard all but one handle. Estimate how many rows of spoons you'll need, as well as how many spoons per row. On a paper plate, pour out 1 tablespoon of blue paint per row. Leave first blob as is; add ½ teaspoon of white to second blob, 1 teaspoon of white to third blob and so on. Use the handle you saved to blend. Paint one row of spoons—backs only—in each color. Let dry.
Step 3: Add glue to the outer rim of each spoon, and place a row of lightest-color spoons around top edge of can so top edge of spoon extends above lip of can. Begin a second row, placing spoons between those on previous row and overlapping by a third. Continue adding rows in that way until can is covered.