Below are some alternate tunings to make your Strat sound unique.  Notes shown from lowest to highest.

E-A-D-G-B-E
Standard Tuning

D-A-D-G-B-E
Drop D

D-A-D-G-B-D
Double Drop D

D-G-C-F-A-D
Down One Step

F-B-E-G-C-F
Up One Step

D-G-C-F-A-D
Standard D

C-F-Bb-Eb-G-C
Standard C

E-B-E-G#-B-E
Open E

E-E-B-B-B-B
Used by Soundgarden

C-G-C-G-G-E
Also used by Soundgarden

There are countless other ways to tune a guitar.

How to Tune Your Guitar is a post from: Fender Strat