Birgit Oestergaard primarily expresses herself through a headlong use of materials, technical feasibility and surfaces where the didactic layer are displaced by a seductive exterior aesthetics. In this perspective her art would be considered to be mixed media. The main inspiration for the techniques used derived from textile in the broadest sense. The work "Enough is Enough", expressing despair and frustration, is woven of old torn paintings. Other examples could be the woven rubber pieces in combination with golden leaves and later her knitted pieces to be seen as a comment on beauty and the artistic quality in our grandmother's knitted clothing, potholders, etc. Birgit Oestergaard’s artistic practice aims to build a subtle exchange between un-conventional, non-textile materials and textile techniques with the intention to challenge the traditional distinction between arts and crafts. For many years she has been working with an artistic expression alongside with her lighting designs and the two areas have enriched each other.
A mixed media painting is one which combines different painting and drawing materials and methods. Any materials can be used, including collage items such as pages from magazines, newspaper, photographs, fabric, soil, leaf gold, or packaging. Fine art refers to a skill used to express the artist's creativity, or to engage the audience's aesthetic sensibilities, or to draw the audience towards consideration of more refined or finer work of art. However, even fine art often has goals beyond pure creativity and self-expression. The purpose of works of art may be to communicate ideas, such as in politically, spiritually, or philosophically motivated art; to create a sense of beauty; to explore the nature of perception; for pleasure; or to generate strong emotions. The purpose may also be seemingly nonexistent. Painting is a mode of creative expression, and the forms are numerous.