Patrice & Sis, and anyone who'se interested.
One way to get random is to take 3 sacks and sort your fabrices all the LIGHT into one sack (better label the sacks) the MEDIUMS another, and the DARKs into the third. On second thought don't label the sacks. You can put all the random sized scraps you have into the proper sack.
Now measure out your base squares (which ever kind you want, even newspaper...but be aware that the ink may rub off. ) Now, have you got your sewing machine ready to roar. Good. Starting at the lovwer left corner of the base square (if you're left handed it's okay to start at the right corner.) Pick a piece of fabric out of one of the sacks. Okay, label the sacks "1", "2" & "3" so you can keep track. Pin that piece at the corner right side up, now take a second piece out of a different sack, place it wrong side up,and sew it on to the 1st piece with a 1/4" seam, with the directions as given by another reply-er, turn the 2nd piece right side up and finger press it flat. Now take a 3rd piece out of a sack, and add it to base following the previous directions. Keep adding pieces until the base is covered.
You can take pieces from any of the sacks to add, no need to worry about whether the colors go together, or if they are light, medium or dark. Remember the quilts you've seen made with pink and orange, and even fushia (?). If the pieces don't quite fill the space, cover the "absent" spot with the next addition. Don't forget lace or ribbons, or something you have saved to use sometime.
When, at last piece is added trim the edges of the base and start the second base. Hope that helps the matching Addition. When you have all the blocks finished start the embelishing (?) Have fun! LOL, Cecelia