I like sending my students home with articulation homework that doesn't look like word lists, but gets to the point. Included are 30 pages of cards that include the following sounds...
Initial /k/ and /g/
Medial /k/ and /g/
Final /k/ and /g/
Initial, Medial, and Final /sh/ in elementary and middle school appropriate words
Initial and Medial /r/
Initial, Medial, and Final /th/ (voiced and voiceless)