Find the center of each of your 12x5.5" boards (lengthwise) using your tape measure and draw a long down the center. To make the two smaller vases, you will then divide the board into 4 equal squares of 3" each. Mark these lines accordingly. For the taller vase, you will mark (2) 3" squares and (2) 6" rectangles (you will have 3" of waste). To prevent splintering, wrap masking tape around each area that you will cut.
Using your Ryobi 18V miter saw, make each cut, beginning with the shorter cuts. Remove tape after all cuts have been made.
Choose three of the 3" boards to be the top of the vase. Find the center of each using a tape measure and make a small X. Using your Ryobi 18V drill/driver and a small drill bit, make a pilot hole in each. Switch to a 1/2" drill bit (or a 1" depending on the size of your vase) and drill through your pilot hole on each.
Center your vase upside down over each hole and trace around the lip of the vase. Using your Ryobi 18V Rotary Tool, carve out a small lip for your vase to sit in. It does not need to be very deep, just enough to give the glue more surface area to grab. Use the sanding bit to smooth it out when you are happy with the depth.
Apply Super Glue or Gorilla Glue to both the wood and the top rim of the vase. Set aside to dry.
While the vase is drying, assemble the remaining pieces. Use wood glue on each piece and a damp paper towel to wipe off excess after desired placement is achieved. Set aside to dry. Once all pieces have dried, attach the top/vase piece to the rest of the vase using wood glue. Let dry for 30min to an hour. Use a high grit sandpaper to soften any rough edges and add flowers!