This is one of my favorite sites for practicing your best speech sounds with just the vowels.  I call them Syllable wheels.  Just print out your speech sounds and practice.

 

Example if you're working on Rs, use your finger to go from the middle consonant to the vowels.  Ray, Ree, Rye, Row, Roo .

To practice your sound at the end just reverses: Air, Ear, Ire, Ore, you're (note Are, Er are difficult to illicit with this worksheet as they are not long vowels)

 

I hope this helps!