McCall'sQuilting.com has a lot of block patterns available for free download. This includes some applique patterns that are worth taking a look at. Their block sizes vary so make sure you know what size their patterns are for.
Flower of Spring. This is for a 9 inch block but you could enlarge it, or minimize it and do 4 of them.
http://mccallsquilting.com/qb/pattern_507/
Honey Bee is a combo pieced and applique.
http://mccallsquilting.com/qb/pattern_205/
Primitive tulip
http://mccallsquilting.com/qb/pattern_404/
Ring of Hearts. I will demo this block in a 12 inch size for class and I have a heart that will work for this.
http://mccallsquilting.com/qb/pattern_102/
These are all beginner level. They have others that are above that.
Another site that has loads of patterns to choose from...
http://www.freeapplique.com/index.html
These are probably mostly more advanced.
http://www.freequiltpatterns.info/QuiltCategories/FreeAppliquePatterns.htm
Great visuals for different methods of applique.
http://www.nmia.com/~mgdesign/qor/begin/applique.htm
Have fun ladies, I'll see you this week.