I based the proportions of the carrier ingredients, beeswax and sweet almond oil, on this recipe from Soap Deli News, which contains and links to numerous DIY projects.
Because I wanted to be sure my perfume would have a strong, lasting scent, I used proportionally more essential oil in my recipe. So, here's what I ended up with:
2 tbsp beeswax
2 tbsp sweet almond oil
Heat these two ingredients in the microwave for 30 seconds at a time and stir until it's liquid. Then add the essential oil:
Citrus Splash - 2 ml orange essential oil, 1 ml litsea essential oil, 1 ml bergamot essential oil
This recipe makes two ounces. The texture is a little stiff, particularly in these pots, meaning you have to rub it a good bit or warm it in your hands to get it out and onto your skin. Next time, I'll either use a little more almond oil to make it softer or try putting it in lip balm tubes.
As you can see from the pictures, I also made a rose-scented version using Rose Geranium oil and something else, but try as I might, I can't remember the second ingredient. It was something I added to lighten up the rose scent and add a fresh note, but I'll just have to try something new next time.