Background: This study aims to summarize and analyze the possibilities, findings, and results related to the concept of green cities as an environmentally friendly and sustainable model of urban development. A key aspect of this is the integration of innovative, environmentally friendly solutions into a city’s development. Methods: The study integrates a systematic literature review, synthesizing prior research on the topic, with a detailed examination of a Hungarian city as a case study. This approach provides evidence of how an innovative environmental program and climate strategy can enhance a city’s green spaces, boost its competitiveness, and strengthen its image. Results: The study’s insights, derived from a systematic literature review synthesizing global green city research, can serve as a good example to effectively assist the implementation of future green projects in both domestic and international cities. Compilation of key indicators as a model from both the literature and case study, includes the development of green networks, recreational spaces, and an improved city image through community engagement. Conclusions: By examining the multifaceted impact of various green city functions and solutions on sustainability, the analysis offers a comprehensive understanding of how and to what extent green city concepts contribute to shaping the city’s image. Furthermore, the case study helps to recognize that smaller settlements are also capable of implementing effective, green strategies that contribute to the development of their image. A future research direction could be to assess whether cities have strategic planning documents that specifically promote green cities and solutions, and if so, for what time frame they are designed. Such research would allow us to categorize cities based on their green city strategies.