From Whiskey Tango Foxtrot.  

Materials:

• Blank canvases.
• Letter stickers.
• Finger paint.
• Paintbrushes or fingers.

Directions:

1. Lay down stickers on blank canvas. Be creative with arrangement and what you want it to say!

2. Have children paint over the canvas and stickers. I find it best to use one color at a time, that way you don’t have all the colors mixing together, creating a brown mess. I let her choose which colors she wanted to use each time. It doubles as a lesson on colors!
   
3. Cover entire canvas with paint.
   
4. Remove stickers before paint dries. I went back over any areas that bled with a white paint marker to make the lines a little cleaner and crisp.

Adapted from Easy Preschool Crafts.

(This would be a great craft to send to grandmothers!)

Materials:

• sheet of black or blue construction paper for background
  
• green construction paper for hand
  
• brown or other color for the pot
  
• various color scrap paper for flowers
  
• marker or crayon
  
• glue
  
• scissors
  

Directions:

1. Find or make a simple template for a flower pot and flowers. Trace and cut out a flower pot and several flowers of different colors.
   
2. Trace your hand on green construction paper and cut out.
   
3. Glue hand onto background paper.
   
4. Glue pot and flowers onto hand print as shown.
   
5. Write "Happy Mother's Day" on the pot.
   

Adapted from Babble Dabble Do. 

Materials

• Lemons (2 lemons per volcano)
  
• Baking Soda
  
• Liquid Watercolors/ Food Coloring
  
• Craft Stick
  
• Dish soap
  
• Tray
  
• Cup & Spoons
  

Adapted from Growing Kids Learn.  

Materials:

• Carrot top (2-3 cm from stem with some root growth remaining on top)
  
• Shallow dish
  
• 10 Cotton balls
  
• Water
  
• Sunny and protected spot
  

Adapted from Paging Fun Mums.  

Materials needed:

• Plastic bottle caps (cleaned well)
  
• Plastic spoons
  
• Glue dots (found at any craft supplier)
  
• Plastic to make wings (I used the insert from a reusable shopping bag but we’ve used old milk bottles before too)
  
• Permanent pen (to mark out wings)
  
• Scissors (to cut out wings)
  
• Kindy Glitz or other craft supplies to decorate wings
  
• Googly eyes
  

Directions:

1. Draw a set of butterfly wings on the plastic bottle and cut it out.
2. Glue the wings and eyes on to the bottle cap.
3. Decorate the wings.
4. Hide the bugs some place to surprise someone!

Idea adapted from No Time for Flashcards. 

Materials:

• Potatoes that will fit in your child's hand.
• Paper.
• Markers.
• Scissors.
• Ink pad.

Directions:

1. Draw a shamrock on the paper.
2. Cut the potato in half.
3. Let your little one stamp away!
4. Cut it out once it's dry.

Idea adapted from Toddler Approved.

Materials:

• Construction paper in the colors of the rainbow.
• Painter's tape

Here's a great post from one of my favorite bloggers, talking about how important the process is, in addition to the finished product.  There is also a great list at the bottom of projects that are age appropriate!

From the Artful Parent.

Materials

1. Bowls or Dishes (for making the ice)
   
2. A large tray with sides
   
3. Salt
   
4. Liquid watercolors or food coloring
5. Droppers or a spoon

Directions

The post in the link above actually has really detailed instructions, with helpful hints for how to talk about what is happening with your kids.  Here are just some bullet points:

1. Freeze water overnight in a variety of bowls of different shapes and sizes.
   
2. The next morning, loosen it with some warm water and place the ice on a tray with a lip.
3. Let the kids pour salt over it and watch it melt.
4. Pour food coloring on it and watch where the colors go.