Can you practice latte art with UHT milk? I want to practise my latte art skills.

However, using fresh milk is quite expensive so my solution was to use long-life (UHT) milk, which is quite a bit cheaper than using fresh milk.

Will using UHT milk somehow affect this negatively?

Do you know of any other cost-effective ways of practising latte art?
Back then when i got my first espresso machine i was recommended a method using a pinch of dishwashing soap in a pitcher with water. This way i was able to practice and enhance my frothing skills. 

Be sure to find the correct dose of soap and be aware that soap residue can stick to the steamwand, so remember to clean it by purging the same way as you would froth milk. 

I find this method much more suitable than wasting a lot milk if you intend to do it a couple of times a day for practicing.