Have you been keeping up with your core strengthening? Hopefully you have and are ready for something new. If you feel comfortable doing you general core poses then you may want to try adding something new to your daily routine. Many of these poses are minor variations of the originals.
3 point prone hand stand
Start in the prone handstand pose. Once in a prone handstand pose bring your knee toward your elbow.
Try alternating knees every 5-10 seconds to start off. Remember to focus on you posture keeping your shoulders and hips inline.