Her before and after pictures of the refurbished dolls reveal a stark difference between the out-of-proportion Barbie dolls and make-up clad Bratz dolls, and her more natural alternative.
"Here are the Tree Change Dolls (ex-Bratz dolls) playing outside the way kids should, after their radical make-unders," Ms Singh wrote on her website, Tree Change Dolls.
"These dolls have been rescued and rehabilitated from op-shops and tip shops around Tasmania.
"These lil [sic] fashion dolls have opted for a 'tree change', swapping high-maintenance glitz 'n' glamour for down-to-earth style.
"I hand repaint the dolls faces, mould new shoes, and my mum sews and knits their clothing."
The result is something that any little girl can relate to and their creator matches their new looks by photographing them doing exactly what children enjoy - climbing trees, swinging on tyres and romping around outside.
MGA Entertainment's Bratz website describes their dolls as "the only girls with a passion for fashion" who are all about "the hottest fashion trendz" and "serious attitude".
Ms Singh explained that the inspiration for her modified dolls came from something a little more humble.
"My sisters and I grew up playing with second-hand dolls and home-made toys in the beautiful Tasmanian natural environment," she wrote.
"I love the satisfaction of repairing and reusing discarded items to give them a new lease on life."
Since sharing images from her project online, Ms Singh has received an overwhelming amount of support from parents requesting to purchase the toys.
She now plans to set up an online store on Etsy where she'll sell the second-hand dolls to loving homes, complete with a before picture.
See more before and after images here:
Image 1 of 11: Before and after: Dolls recreated by Sonia Singh. Photo / Sonia Singh, treechangedolls.tumblr.com