Chalk Paints

"Rarity, when you go shopping, could you please pick me up some chalk and a dull knife?" asks Sweetie Belle, walking towards her saddlebags. "I have the bits for it, I made them selling apples I bucked at Apple Bloom's house!"

"Why in Celestia's name would you want a knife? You know you are not allowed to cook!" Rarity screeched.

"It's for a suprise, I'm... carving. You might as well buy a first-aid kit as well, come to think of it." replied Sweetie as she hoofed her bits to her older sister.

Rarity left the house with a "Hmmph!", and as soon as the door closed behind her Sweetie raced into her room. Heaving, Sweetie Belle opened her window and levitated herself down. Exhausted, she rested for a minute until Rarity was out of sight.  She went over to Scootaloo's cottage, and knocked quietly. Scootaloo opened the door and with a tiny nod Scootaloo gave her an electric razor and a ride to Rainbow Dash's house.

As soon as Sweetie opened the door, Rainbow's loud snore was heard, as she often napped during the day. As Sweetie approached with a razor and plastic bag, a "CLICK, BZZZZZZZZZZZZZZZ" was heard as the razor turned on. Scootaloo snickered as the snoring blue mare was shaved completely clear of even any mane in sight.

"C'mon, you need to get back! I see Rarity heading for the boutique!" exclaimed Scootaloo, pointing out the white unicorn. Sweetie teleported them to their homes with a blast of magic, and used a masking spell to disguise the bag as empty.  As soon as Rarity came in, Sweetie greeted her and retrieved her items.  Nopony knew what Rarity was buying a knife for that day...