The 'Happy' singer recently met with designer Stella - who shares similar views to Leona on the use of animal products in fashion - to discuss the possibility of her releasing her own branded products.
A friend told Britain's Daily Mirror newspaper Leona had said: "I'm on a mission. I'd love to promote a line of non-leather bags and shoes that are affordable. I think more needs to be available and not so expensive.
"There's so much I want to do. I've always wanted to have my own fashion line, and that's something I want to focus on next year."
Vegetarian Leona, 24, doesn't wear suede, leather or other animal products and is public supporter of PETA, while Stella has been a long-time vegetarian - just as her father Sir Paul McCartney and late mother Linda Mccartney were.
The source added: "Leona and Stella get on like a house on fire. They met at the recent Children In Need charity show at London's Royal Albert Hall. They are both vegetarians, don't wear leather and are huge animal lovers. The line would be very animal friendly."
Meanwhile, Leona's new LP 'Echo' topped the UK albums charts yesterday (22.11.09).
She said: "I'm absolutely thrilled. I put my heart and soul into it, so it's great to get this reaction. I spent nearly nine months recording it, so it's so great to finally let everyone share and enjoy it."