There are many books on the market that have cutting practice pages inside them. We don't own any, but I know the Kumon ones are popular.
A less expensive idea would be to use some of the many free printables offered on the internet for cutting practice. Here are just a few I came across with a quick internet search:
Of course an even cheaper option (no printer ink used) would be to draw your own lines on paper. Workbook pages, printables, or DIY versions would make a great independent activity for trays.
A fun Easter craft to do would be to have your child cut strips of contruction paper and then cut the strip into little pieces to glue on a cross or egg shape to make a collage. I plan for us to make an egg with a few different colors. Directions and templates can be found at DLTK.