A possibility of shaping unconventional building envelopes located in the temperate climate of the Central Europe Plain, and optimized with regard of the direct solar radiation incident on these envelopes in summer and winter is presented in the article. The developed methodology proposes a number of assumptions related to the geometrical and physical properties of the examined building envelopes as well as their parametric solar model. A novel initial parametric design model of the simulated envelopes was invented. On the basis of this model, a number of discrete design models were created to perform a lot of computer solar simulations according to the algorithm of a developed novel method of the shaping solar envelopes. The analysis of the results led to identification of several significant relationships between the properties of the adopted parametric design model and the invented solar model of the envelopes to search for their effective performance in the predicted solar environment. The obtained tendencies, diagrams and neural network expressing the basic relations between the above parametric models are a basis for further, broader explorations in the field of shaping effective building envelopes. After a slight modification of the coefficients used, the invented parametric solar model and the proposed method can be employed to search for rational envelopes operating in different temperate climates.