I mentioned this in Sensei's thread above, but I often draw portals with my finger.
I don't need to summon any objects or find a specific location for this, I just draw a large circle right in front of me.
My finger usually leaves a trail of glowing light, and then I push the middle section out to reveal the new scene and jump through.
I personally do this in mid-air, but AnotherDreamer recently tried this and had more luck drawing it on a solid surface like the wall or ground.
If you can convince yourself that the finger painting will work, the rest isn't much of a stretch for the mind - you just step through the opening like you would in waking life.
Something that I find really helps with all forms of teleportation is feeling the desired location, rather than just visualising it. By feeling, I mean making an emotional connection with the place you'd like to arrive in. Imagine what the 'energy' of the location will feel like, and let that feeling become a tangible reality.
Good luck, I hope you find a technique that works for you!