To create a seamless pattern in Adobe Illustrator, do the following: Step 1: Create a rectangle of 500 x 500 pixels Step 2: Fill the top with elements Step 3: Duplicate and move 500 pixels below Step 4: Repeat for the left and right side Step 5: Fill up the center Step 6: Select the rectangle from step 1, duplicate it and move it to the back ( Shift + Cmd + [ ) Step 7: Now drag the whole group into your Swatches panel That's it! Let us know if you need any help :)