For ointments I basically take 1 part of infused oil and 1 part of lanolin and then add a bit of beeswax if I want it thicker. For a basic ointment to cover every day needs I also will add 1% of Lavender and 1% of Tea Tree Essential Oils. Now I weigh everything, but to begin with I just added until it smelled right. This makes a nice soft ointment like a Vaseline that will coat a babies bottom and leave a barrier. It is also perfect for scraped knees etc. For things like insect bites & chicken pox I prefer to have something stiffer and waxy, not greasy, so I often use 5 parts of infused oil to 1 part of beeswax and put it into a lip balm tubes so that it can be rubbed on, and my kids can keep it in their pocket.
There are many other things that will add to an ointment that I like to use. Emu Oil, Hemp Oil, Shea Butter and Essential Oils are favorites of mine. I think the synergy is often amazing.
In a pinch in the winter when I run out of my oil from the previous summer I will do more oil using dried herbs. My favorite combination is Comfrey, Calendula, and Chamomile. It makes a nice herbal oil for lotions, basic diaper ointments etc. It is not nearly as potent as the oil I make in the summer, but it works and is a good place for beginners to start.
For another variation you can use honey instead of lanolin, and add a bit of beeswax so that it won't separate. I use unpasterized honey that is local to me.
If you are just new into making infused oil try infusing Comfrey, Calendula and Chamomile (they are herbs that you can easily buy, and when you want to start growing your own, they are easy to grow too) in the best Olive Oil you can buy. The take equal parts of your infused oil, Hemp Oil, & Shea Butter and gently melt together. I like to add 1% Rose Geranium to this mix and I call it "Heavenly Herbal Balm". You need to set your jars in the fridge or they will not set up. This makes a nice body butter that would be great for pregnant mom's, skin problems etc. If you have Emu Oil you could also add some of that, but you might need some beeswax then to help it to set up. Let inspiration be your guide and I am sure you will come up with something wonderful.
For those of you who have lots of experience infusing oils try infusing into Castor Oil, it has different properties than Olive Oil and will give you different results.
Hopefully I have given those who want to learn some food for thought, and you will be able to create something that will help someone near and dear to you.