As far as Heirlooms go im not sure how much of what I got from my big was Heirloom and how much was just cute items she gave me.
I got one Teddy bear that i think is an Heirloom and its got pear earings and then a sailboat on the foot. its super cute. She also gave me this AWESOME poem called "A Sense of Sigma" and she took paint chips and cut them into trianle like pieces and glued them all around the poem then framed it! I LOVE It and always keep it close to my desk. in our chapter Family letters were big... and so was makin your lil a bag.. like a tote with our letters on it. We all LOVED ours. Oh the other thing that our bigs made us that we LOVED was our Binders. Most of them took a binder and puffy-painted it with something sigmaish and then something else that the lil liked and then we use the binders for our "sigma notes" like at Chapter meetings and what not... mine has Tigger in the S.S.S. sailboat. I LOVE it and another girl in our pledge class got one that had a Carebear on it but on its belly was a either a sailboat or SSS I don't remember. Anyway those are just ideas.
Editted to Add: If you want me to PM you the poem I will and the other thing that some bigs an lil's did for eachother was sew pillows. Or buy one and put our letters on it.